Fuser Narrow Media Sensor Service Check - Lexmark T640 Service Manual

Fuser narrow media sensor service check

If any of the following error codes are displayed, a problem may exist in the area of the narrow media sensor
assembly: 201.04, 201.14, 201.24, 201.34, 201.44, 201.54, and 201.94.
Fuser exit and fuser narrow media sensor status check
Printer not printing— no media
over sensors
Exit sensor open
Narrow media sensor open
FRU
1 Fuser narrow media sensor
(sensor test)
2 Fuser narrow media sensor
cable
3 Fuser narrow media sensor
flag
4 Fuser assembly
Fuser narrow media sensor
cable
Fuser board
Fuser to system board
cable
System board
5
Printer printing—media over
sensor(s), non-narrow media fed
through the printer
Exit sensor closed
Narrow media sensor closed
Action
Enter the Diagnostics mode, select BASE SENSOR TEST, and
select the NM Sensor to test it for proper operation. If the narrow
media sensor fails the test, go to step 2; if the narrow media sensor
does not pass the test, go to step 5.
Check the fuser narrow media sensor cable for correct installation or
any signs of damage to the cable or to the connectors. If no problem
is found, go to step 3;. If a problem with the installation is found,
install the cable correctly. If damage to the cable or the connectors is
found, replace the cable.
Make sure the sensor flag is not binding and is operating properly. If
the sensor is operating properly, go to step 4. If the sensor is not
operation properly, repair or replace the sensor assembly. See
"Fuser narrow media sensor removal" on page
Check the continuity of the fuser narrow media sensor cable. If
incorrect, replace the cable; if correct, check the continuity of the
fuser to system board cable. If incorrect, replace the cable; if correct,
replace the following FRUs in the order shown:
• Fuser board
• Fuser assembly. See
• System board. See "System board and inner shield removal"
on page 4-77.
With the redrive assembly removed from the printer, enter
Diagnostics mode and run the printer test from tray 1 and observe
the media as it passes over the exit sensor. Check to see that the
sensor flag is operating correctly. If the sensor flag and hardware are
operating incorrectly, repair or replace the failing sensor assembly. If
no problem is found, check the fuser for any signs of media in the
fuser or any signs of toner or other contamination. If a problem is
found, clean or remove the debris or contamination.
Printer printing—narrow media
fed through the printer
Exit sensor closed
Narrow media sensor open
4-35.
"Fuser assembly removal" on page
Diagnostic information
4061-xx0
4-27.
2-93